We've been up 12 out of 13 days. There will be a pullback and if Ackman says anything they will scoff a couple of points. So, if you've bought on the way down, either protect yourself with options or take your gains. JMO
Is there really anything else he can say at this point, that the market will react negativly to? After he said he publicly he was still short, the thing still goes up more. Read the writeup from Chapman, smart guy and others feel the same.